Many users have access to more than one trust's data, usually either as the result of a recent trust merger or to view the other trusts in your local STP or ICS. You can use the same mechanism to switch between trusts, or between the trust and system views.
To switch views, click on the trust name. On a desktop computer, you'll find this in the top right corner underneath your name.
You can then select a trust to view, either by searching by name, filtering by trust type, or scrolling down the alphabetical list.